OldWolf,

When I rant about the Rotella T 5W40 Synthetic in the Diesel there is a DisClaimer:
1.I treat the 5W40 just like it's a Mineral based Lube...3000 Miles and the Oil+ Filter gets changed.
[It's advantage is slightly lower cost and much more of a
Diesel additive package (CAN YOU SAY Zinc?) ]
2.As pointed out earlier,the OIL is the Coolant AND Lubricant for both the
Injection Pump AND the Turbocharger![AND Turbos BEAT the FOOL out of OIL]

DO NOT MIX: BRANDS , VISCOSITY(s) !
Nothing Good can come from "Playing" Petro-Chemist!

The Mobil 1 Truck and Turbodiesel [A.K.A. Delvac 1]is rated for C [Compression]type engines.

I would feel comfortable running 5K oil+ filter intervals with:
Royal Purple,Redline and Delvac 1 WITHOUT oil testing. (O.K. Amsoil Too)

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'84 300SD sold
124.128

I never had any cranking issues when running synthetic in the winter. The only time I had problems was with 15w40 dino which turned over real slow on those super cold mornings.

You can get that fake synthetic pretty cheap, Rotella T 5W40, which is a good oil and from my experiance with my 300SD still allowed the old 617 to crank over quickly.

After using both I would never run a dino oil in any old MB diesel in the winter.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I used Shell ROTELLA "synthetic" 5w-40 (blue jug) for years in VW and Mercedes diesel best bang for the buck.

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1993 Mercedes 300D 2.5

1987 Mercedes 300D 3.0

2000 Volkswagen JETTA TDI diesel 5 speed

2002 Lexus ES300

2006 Lexus GS430

IYHO. Some of us prefer "real synthetic".

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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI


Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous

“Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss

I change oil at home every 3000 miles so I do not need "real synthetic"

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1993 Mercedes 300D 2.5

1987 Mercedes 300D 3.0

2000 Volkswagen JETTA TDI diesel 5 speed

2002 Lexus ES300

2006 Lexus GS430

Mobil 1 5w-40 Turbodiesel is no longer the same as Delvac 1. It used to be the same when it was called Mobil 1 5W-40 "Truck and SUV." I believe they both have the same CJ4 rating, but the additives are different. Delvac 1 is the same formula as the old 5W-40.

It doesn't magically cost less than the new stuff, it's different!

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85 300D 180k